You have pressed the hide hud key combination, which is by default [ALT] + Z.
Now if you have… let’s say GeForce Experience, then that program has the exact same combination. Now that is something that could have happend, but maybe don’t press that combination
Blizzard does not compensate any SR
And even if they did, i doubt they would have done it for you as it was something you caused.
You can learn more about ^ that here: Overwatch Technical Issues, SR Loss, and Leaver Penalties
Please do not spam, this can lead to punishment on your forum account. Asking Blizzard staff to modify your account so you’ll get something better is also not allowed. They won’t do it, so please do watch your wording.
Your endorsement level fluctuating between 3 and 4 is normal, you’re not getting enough endorsements.